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94 results for “dieback”
Ability of the ash dieback pathogen to reproduce and to induce damage on its host are controlled by different environmental parameters
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Neighbours matter and the weak succumb: chalara ash dieback infection is more severe in trees with fewer conspecific neighbours and lower prior growth rate
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Landscape epidemiology of ash dieback
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Point-of-care diagnostics and resistance phenotyping to combat ash dieback
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Data from: Competition and soil-microbe mediated interactions following dieback of a dominant wetland plant
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Supplementary material 1 from: Pourmoghaddam MJ, Lambert C, Surup F, Khodaparast SA, Krisai-Greilhuber I, Voglmayr H, Stadler M (2020) Discovery of a new species of the Hypoxylon rubiginosum complex from Iran and antagonistic activities of Hypoxylon spp. against the Ash Dieback pathogen, Hymenoscyphus fraxineus, in dual culture. MycoKeys 66: 105-133. https://doi.org/10.3897/mycokeys.66.50946
Discovery of a new species of the Hypoxylon rubiginosum complex from Iran and antagonistic activities of Hypoxylon species towards the Ash Dieback pathogen, Hymenoscyphus fraxineus, in dual culture
Data from: Will natural resistance result in populations of ash trees remaining in British woodlands after a century of ash dieback disease?
Novel pests and diseases are becoming increasingly common, and often cause additional mortality to host species in the newly contacted communities. This can alter the structure of the community up to, and including, the extinction of host species. In the last twenty years, ash dieback disease (ADB) has spread into Europe from East Asia. It has caused substantial mortality in ash tree (Fraxinus excelsior L.) populations. However, a proportion of the individuals in most populations appears to be less susceptible to ADB and resistance seems to have high heritability. These observations have led to suggestions that ash populations may be sustainable after the disease. In order to test this hypothesis, I modified an existing model of UK woodland (parameterised for Wytham Woods, Oxfordshire) to take into account the impact of ADB, and allowed offspring to inherit resistance traits from their parent. The results suggest that ash populations would still exist in 100 years but at lower levels than they are currently. For example, when the initial proportion of resistant individuals is about 10% and heritability of resistance is 0.5, then the population of ash falls to about one third of present levels. The proportion of individuals initially resistant to ADB had a larger effect on population size after 100 years than the heritability of resistance. The fact that the initial size of the resistant population is important to achieving a high population size in the presence of ADB suggests that a selective breeding programme with the intention of augmenting the natural ash populations would be beneficial.
Complete workflow for the prediction of the secretome of Fusarium oxysporum f. sp. albedinis, the causal agent of palm dieback
<p>Custom scripts for mining the secretome of <em>Fusarium oxysporum</em> f. sp. <em>albedinis</em>, the causal agent of date palm dieback disease. </p>
Tropical montane forest in South Asia: Composition, structure and dieback in relation to soils and topography
<p>We evaluated the composition, structure and dieback of a montane forest in relation to soils and physiography of an important biogeographic region that has been sparsely studied. Our objectives were to: 1. Describe the forest composition and structure; 2. Assess the current extent of dieback; and 3. Relate tree composition, structure, and dieback proneness to edaphic and physiographic measures. We enumerated all live and dead standing plants ≥ 3 cm diameter at breast height (DBH), in thirty 20×15 m<sup>2</sup> over story plots. We measured all regeneration <u><</u> 1m height in subplots, sampled soils and measures of physiography, and visually rated the proportion of crown die-back, and recorded standing dead trees.</p>
Data from: The role of nutritional impairment in carbon-water balance of silver fir drought-induced dieback
<p><span>Rear-edge populations at the xeric distribution limit of tree species are particularly vulnerable to forest dieback triggered by drought. This is the case of silver fir (Abies alba) forests located in the southwestern of Europe. While silver fir drought-induced dieback patterns have been previously explored, information on the role played by nutritional impairment is lacking despite its potential interactions with tree carbon-water balances. We performed a comparative analysis of radial growth, intrinsic water-use efficiency (iWUE), oxygen isotopes (δ<sup>18</sup>O) and nutrient concentrations in leaves of declining (DD) and non-declining (ND) trees in silver fir in four forests in the Spanish Pyrenees. We also evaluated the relationships among dieback predisposition, intraspecific trait variation (wood density and leaf traits) and rhizosphere soil physical – chemical properties. The onset of growth decline in DD trees occurred more than two decades ago, and they subsequently showed low growth resilience against droughts. The DD trees presented consistently lower foliar concentrations of nutrients such as P, K, Cu and Ni than ND trees. The strong effects of foliar nutrient status on growth resilience indices support the key role played by mineral nutrition in tree functioning and growth before, during and after drought. In contrast, variability in wood density and leaf morphological traits, as well as soil properties, showed weak relationships with tree nutritional status and drought performance. At the low elevation, warmer sites, DD trees showed stronger climate – growth relationships and lower δ<sup>18</sup>O than ND trees. The uncoupling between iWUE and δ<sup>18</sup>O, together with the positive correlations between P and K leaf concentrations and δ<sup>18</sup>O, point to deeper soil/bedrock water sources and vertical decoupling between nutrient and water uptake in DD trees. This study provides novel insights into the mechanisms driving silver fir dieback and highlights the need to incorporate tree nutrition into forest dieback studies.</span></p>
FIGURE 1 in Studies of botryosphaerialean fungi associated with canker and dieback of tree hosts in Dongling Mountain of China
FIGURE 1. Phylogram of Botryosphaeriales based on combined ITS, LSU, and TEF-1α genes. MP and ML bootstrap support values above 50 % are shown at the first and second position respectively. Thickened branches represent posterior probabilities above 0.95 from BI. Type species are in bold. Strains in the current study are in blue.
FIGURE 2 in Studies of botryosphaerialean fungi associated with canker and dieback of tree hosts in Dongling Mountain of China
FIGURE 2. Morphology of Phaeobotryon rhoinum from Rhus typhina (CF 201782). A: Symptoms on the host. B, C: Habit of pycnidia on a twig. D: Transverse section of pycnidia. E: Longitudinal section through pycnidia. F–H: Conidiogenous cells and conidia. I: immature conidia. J–K: mature conidia. Scale bars: B = 1 mm; C–E = 500 μm; F–K = 10 μm.
FIGURE 2 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 2. Morphology of Nectria ulmicola from Ulmus davidiana var. japonica (BJFC-S1372, holotype). A–C: Sporodochia on natural substrata. D: Median section of astipitate sporodochium. E–F: Conidia. G: Conidiophores. H: Immature conidiophores. Scale bars: A–D = 200 μm; E–H = 10 μm.
FIGURE 6 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 6. Morphology of Nectria pseudotrichia from Ulmus pumila (BJFC-S1392). A: Host branch. B–D: Synnemata on natural substrata. E: Median section of synnema. F–H: Conidiophores and conidia. I: Conidia. Scale bars: C = 1 mm; D–E = 500 μm; F–I = 20 μm.
FIGURE 4 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 4. Sexual morph of Nectria dematiosa from Malus baccata (BJFC-S440). A: Host branch. B–D: Perithecia on natural substrata. E–F: Median section of perithecium. G–I: Asci. J–L: Ascospores. Scale bars: B–C = 1 mm; D–E = 500 μm; F–L = 20 μm.
FIGURE 1 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 1. Phylogram of the combined act, LSU, ITS, rpb2, tef1, and tub2 gene sequences based on the MP, ML, and BI analyses. Values at the nodes indicate the Maximum Parsimony bootstrap proportion (left, MPBP ≥ 50%) and the Maximum Likelihood bootstrap proportion (right, MLBP ≥ 50%). The branches with significant BIPP values (≥ 0.90) in the BI analysis are thickened. Scale bar = 200 nucleotide substitutions. *Ex-type/Ex-epitype isolate. The new Nectria species resulting from the current study is highlighted in bold.
FIGURE 3 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 3. Morphology of Nectria balansae from Aphananthe aspera (BJFC-S1389). A: Host branch. B–D: Perithecia on natural substrata. E–F: Median section of perithecium. G, J, K: Ascospores. H–I: Asci. Scale bars: B–E = 500 μm; F, H, I = 50 μm; G, J, K = 20 μm.
FIGURE 5 in Molecular phylogeny of Nectria species associated with dieback and canker diseases in China, with a new species described
FIGURE 5. Asexual morph of Nectria dematiosa from Rosa xanthina (BJFC-S441). A: Host branch. B–C: Astipitate sporodochium on natural substrata. D–E: Median section of astipitate sporodochium. F–G: Conidia. H–J: Conidiophores and conidia. Scale bars: B–C = 1 mm; D–E = 500 μm; F–J = 20 μm.
Infected Leaves Synthetic Dataset - Ash Tree Dieback
<p>A dataset of synthetic ash tree leaves with accompanying labels for leaves of infection level: Healthy, low level and mid level. The images and labels are already split into train and test sets. The synthetic leaves are placed on a set of real background images of ash tree leaves and branches to approximate an appropriate background. </p>
Data from: Mechanisms of severe dieback and mortality in a classically drought-tolerant shrubland species (Arctostaphylos glauca)
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.